Phantasm

Pros:

Strong mob control support.

Cons:

Slow attack.

Slow movement speed.

Level 1: Stasis
Energy cost: 10

Puts targeted unit in stasis for 12 seconds. Stasised unit cannot move, attack, be attacked or affected by spells for duration of stasis. Removes negative effects from friendly units. Diminishing efficiency against wildlife heroic units.

The Phantasm can freeze any unit for a brief moment - including the hero himself and target ally unit. Any unit that is put into stasis cannot move, perform any action, or regenerate their shields, energy, and/or health. However, target unit is invulnerable to attacks, enemy spells, and has all negative spell effects and status ailments removed.

Level 2: Piercing Void
Default attack can be channeled to deal up to 3x more damage.

The Phantasm does a total of three auto attacks instead of one auto attack on the attack target. However, the attack animation must be complete for this passive to be in full effect. If Phantasm does not complete the attack animation, the damage will be based on where the attack animation was interrupted.

Level 3: Life Hex
Energy cost: 25

Curses target and nearby enemies with Life Hex. When any afflicted unit dies it triggers a Hex Ripple that inflicts 16 (+ 2 x life upgrades) to up to 16 cursed enemies. Hex Ripple dispels Life Hex on damage. Hex Ripple ongoing damage is multiplied for every unit it kills. Hex Ripple can only occur once every 3 seconds. Effect reduced by 90% on heroic units.

Level 4: Temporal Warp
Energy cost: 35

Teleports caster to a friendly unit.

Phantasm can teleport to any target ally, ally structure, personal units, and personal built structures with a 2 second delay on the map.

Level 5: Sever
Energy cost: 65 Cooldown: 12

An attack that strikes target unit for 250 (+ 2 x damage upgrades) damage 4 times. Reset ability cooldown if effect deals fatal damage.

Recommended Perks
Researcher, Survivalist, Contracts, Herbalist, Magician

Upgrades
Upgrade damage to level 5. Upgrade armor with level. Upgrade health. Upgrade energy to half the health upgrades.

One build is to go Herbalist, seek out any Lichen for Mana Potions, and Wyvern Tears for Invisibility Potions, then upgrade health. During incoming attack waves, pop the Invisibility and Mana Potions, then cast Life Hex on as many targets as possible. When the attack wave hits, the first enemy killed with Life Hex will trigger another 15 Life Hex targets and thin out the wave.

Universal Converger
Get Restrain and Ornament, then Solarite until about 200, then Minerals.